As an NYPD cop lay dying at a city hospital, his accused killer coldly asked detectives about the winner of a boxing match that took place the same night.

Demetrius Blackwell, 37, revealed the darkness in his heart when he inquired about the Floyd Mayweather-Manny Pacquiao bout following the 2015 murder of Officer Brian Moore, a prosecutor said Wednesday.

“He’s remorseless and just doesn’t give a damn,” Queens Assistant District Attorney Dan Saunders said in his closing argument.

Saunders’ blistering final statement to the jury marked the end of a three-week trial that focused in part on Blackwell’s mental health.